EP1241869A3 - Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung von Grautönen in einem Bild - Google Patents

Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung von Grautönen in einem Bild Download PDF

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Publication number
EP1241869A3
EP1241869A3 EP02005322A EP02005322A EP1241869A3 EP 1241869 A3 EP1241869 A3 EP 1241869A3 EP 02005322 A EP02005322 A EP 02005322A EP 02005322 A EP02005322 A EP 02005322A EP 1241869 A3 EP1241869 A3 EP 1241869A3
Authority
EP
European Patent Office
Prior art keywords
image
light
gray scale
frequency
effective scheme
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02005322A
Other languages
English (en)
French (fr)
Other versions
EP1241869B1 (de
EP1241869A2 (de
Inventor
Hidetoshi Ema
Masaaki Ishida
Yasuhiro Nihei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001072874A external-priority patent/JP2002264392A/ja
Priority claimed from JP2001304020A external-priority patent/JP3515087B2/ja
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to EP02025036A priority Critical patent/EP1286533B1/de
Publication of EP1241869A2 publication Critical patent/EP1241869A2/de
Publication of EP1241869A3 publication Critical patent/EP1241869A3/de
Application granted granted Critical
Publication of EP1241869B1 publication Critical patent/EP1241869B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
    • H04N1/40037—Circuits exciting or modulating particular heads for reproducing continuous tone value scales the reproducing element being a laser
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Laser Beam Printer (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Fax Reproducing Arrangements (AREA)
EP02005322A 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung von Grautönen in einem Bild Expired - Lifetime EP1241869B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02025036A EP1286533B1 (de) 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung van Grautönen in einem Bild

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001072874A JP2002264392A (ja) 2001-03-14 2001-03-14 露光方法、露光装置、画像形成装置、光変調信号発生装置及びプログラム
JP2001072874 2001-03-14
JP2001304020A JP3515087B2 (ja) 2001-09-28 2001-09-28 パルス変調信号生成回路、半導体レーザ変調装置、光学走査装置及び画像形成装置
JP2001304020 2001-09-28

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP02025036A Division EP1286533B1 (de) 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung van Grautönen in einem Bild
EP02025036.1 Division-Into 2002-11-11

Publications (3)

Publication Number Publication Date
EP1241869A2 EP1241869A2 (de) 2002-09-18
EP1241869A3 true EP1241869A3 (de) 2003-01-22
EP1241869B1 EP1241869B1 (de) 2010-08-11

Family

ID=26611267

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02025036A Expired - Lifetime EP1286533B1 (de) 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung van Grautönen in einem Bild
EP02005322A Expired - Lifetime EP1241869B1 (de) 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung von Grautönen in einem Bild

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP02025036A Expired - Lifetime EP1286533B1 (de) 2001-03-14 2002-03-13 Lichtemissionsmodulation mit einem effektiven Verfahren zur Erzeugung van Grautönen in einem Bild

Country Status (3)

Country Link
US (1) US6731317B2 (de)
EP (2) EP1286533B1 (de)
DE (1) DE60237256D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7360924B2 (en) 2002-12-02 2008-04-22 3M Innovative Properties Company Illumination system using a plurality of light sources

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JP3463294B2 (ja) * 2000-03-27 2003-11-05 株式会社リコー 光走査装置
JP2002365532A (ja) * 2001-06-05 2002-12-18 Ricoh Co Ltd 樹脂非球面光学素子・光走査装置および画像形成装置
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JP5354891B2 (ja) * 2007-11-22 2013-11-27 キヤノン株式会社 画像形成装置
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JP5679110B2 (ja) 2011-01-25 2015-03-04 株式会社リコー 画像形成装置
US8983318B2 (en) 2012-03-16 2015-03-17 Ricoh Company, Ltd. Image forming apparatus with a density sensor for detecting density fluctuations
TWI489905B (zh) 2012-12-13 2015-06-21 Princeton Technology Corp 發光二極體驅動方法及裝置
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JP6418479B2 (ja) 2013-12-25 2018-11-07 株式会社リコー 画像形成方法、画像形成装置
JP6425008B2 (ja) 2014-01-10 2018-11-21 株式会社リコー 画像形成装置及び画像形成方法
JP6256125B2 (ja) 2014-03-13 2018-01-10 株式会社リコー 画像形成装置
JP6364971B2 (ja) 2014-06-03 2018-08-01 株式会社リコー 画像形成装置
JP2016021664A (ja) 2014-07-14 2016-02-04 株式会社リコー 画像形成装置
JP2016114963A (ja) 2014-12-11 2016-06-23 株式会社リコー 入力操作検出装置、プロジェクタ装置、電子黒板装置、デジタルサイネージ装置、及びプロジェクタシステム
JP6562758B2 (ja) 2015-08-07 2019-08-21 キヤノン株式会社 Ｐｗｍ信号生成装置、モーター制御装置及び光走査装置
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US7658526B2 (en) 2002-12-02 2010-02-09 3M Innovative Properties Company Illumination system using a plurality of light sources

Also Published As

Publication number Publication date
EP1286533B1 (de) 2011-09-14
EP1241869B1 (de) 2010-08-11
EP1241869A2 (de) 2002-09-18
EP1286533A3 (de) 2003-11-05
US20020130944A1 (en) 2002-09-19
DE60237256D1 (de) 2010-09-23
US6731317B2 (en) 2004-05-04
EP1286533A2 (de) 2003-02-26

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